A device for outputting a luminance signal is disclosed. The device includes a chrominance judgment unit, a field observation unit, and an output unit. The chrominance judgment unit and the field observation unit are used to determine whether a 3D luminance signal is affected. The output unit outputs a resultant luminance signal according to the determination results of the chrominance judgment unit and the field observation unit. According to the present invention, the resultant luminance signal can be accurately obtained by judging characteristics of the 3D luminance signal and a 3D chrominance signal even if a 3D comb filter is wrongly used in a motion condition.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A device for outputting a luminance signal in an image processing system, a composite video signal of a frame having a chrominance component and a luminance component, wherein a 3D (three dimensional) comb filter receiving the composite video signal of the frame and outputting a 3D luminance signal based on the luminance component, and wherein the chrominance component being modulated onto a carrier frequency, the device comprising: a chrominance judgment unit, comprising: a luminance detection unit, judging whether a difference value between an amplitude of the 3D luminance signal and the amplitude of the 3D luminance signal within a frequency range with respect to the carrier frequency of the chrominance component is lower than a first threshold value; and a chrominance motion detection unit, judging whether a chrominance change between two 3D chrominance signals is greater than a second threshold value; a field observation unit, comprising: a value comparison unit, judging whether a difference value between a maximum value in an N-point cycle of a first field and a maximum value in an N-point cycle of a third field or a difference value between a minimum value in the N-point cycle of the first field and a minimum value in the N-point cycle of the third field is greater than a third threshold value, wherein N is a positive integer; and an edge area detection unit, judging whether the first field is in an edge of the frame; and an output unit, wherein the output unit outputs the 3D luminance signal, of which a component within the frequency range with respect to the carrier frequency of the chrominance component is notch filtered, when the judgment results of the luminance detection unit and the chrominance motion detection unit are true; the output unit outputs the 3D luminance signal, of which the component within the frequency range with respect to the carrier frequency of the chrominance component is notch filtered, when at least one of the difference value of the maximum values and the difference value of the minimum values in the N-point cycles of the first and third fields is greater than the third threshold value, and a detection result of the edge area detection unit is false; otherwise, the output unit outputs the 3D luminance signal.
2. The device of claim 1 , wherein the luminance detection unit comprises: a band pass filter, passing the component within the frequency range with respect to the carrier frequency of the chrominance component; a first subtractor, performing a subtraction of the output of the band pass filter and the 3D luminance signal; and a first comparator, comparing the subtraction result of the first subtractor with the first threshold value.
3. The device of claim 1 , wherein the chrominance motion detection unit comprises: a second subtractor, performing a subtraction of the two 3D chrominance signals; and a second comparator, comparing the subtraction result of the second subtractor with the second threshold value.
4. The device of claim 3 , wherein one of the two 3D chrominance signals is obtained from the first field and the third field, and the other one of the two 3D chrominance signals is obtained from the third field and a fifth field.
5. The device of claim 4 , wherein the first field, the third field, and the fifth field are NTSC standard or PAL standard.
6. The device of claim 1 , wherein the chrominance judgment unit further comprises a carrier frequency observation unit for judging whether the 3D luminance signal and a next 3D luminance signal have a phase difference of 180 degrees.
7. The device of claim 1 , wherein the value comparison unit comprises: a value determination unit, determining the difference value between the maximum value in the N-point cycle of the first field and the maximum value in the N-point cycle of the third field and the difference value between the minimum value in the N-point cycle of the first field and minimum value in the N-point cycle of the third field; and a third comparator, comparing the difference value of the maximum value in the N-point cycle of the first field and the maximum value in the N-point cycle of the third field with the third threshold value and the difference value of the minimum value in the N-point cycle of the first field and the minimum value in the N-point cycle of the third field with the third threshold value.
8. The device of claim 1 , wherein the frequency range with respect to the carrier frequency of the chrominance component is adjustable.
9. A device for outputting a luminance signal in an image processing system, a composite video signal of a frame having a chrominance component and a luminance component, wherein a 3D (three dimensional) comb filter receiving the composite video signal of the frame and outputting a 3D luminance signal based on the luminance component, and wherein the chrominance component being modulated onto a carrier frequency, the device comprising: a chrominance judgment unit, comprising: a luminance detection unit, judging whether a difference value between an amplitude of the 3D luminance signal and the amplitude of the 3D luminance signal within a frequency range with respect to the carrier frequency of the chrominance component is lower than a first threshold value; and a chrominance motion detection unit, judging whether a chrominance change between two 3D chrominance signals is greater than a second threshold value; and an output unit, outputting the 3D luminance signal, of which a component within the frequency range with respect to the carrier frequency of the chrominance component is notch filtered, when the judgment results of the luminance detection unit and the chrominance motion detection unit are true, or outputting the 3D luminance signal when one of the judgment results of the luminance detection unit and the chrominance motion detection unit is false.
10. The device of claim 9 , wherein the luminance detection unit comprises: a band pass filter, passing the component within the frequency range with respect to the carrier frequency of the chrominance component; a first subtractor, performing a subtraction of the output of the band pass filter and the 3D luminance signal; and a first comparator, comparing the subtraction result of the first subtractor with the first threshold value.
11. The device of claim 9 , wherein the chrominance motion detection unit comprises: a second subtractor, performing a subtraction of the two 3D chrominance signals; and a second comparator, comparing the subtraction result of the second subtractor with the second threshold value.
12. The device of claim 11 , wherein one of the two 3D chrominance signals is obtained from the first field and the third field, and the other one of the two 3D chrominance signals is obtained from the third field and a fifth field.
13. The device of claim 12 , wherein the first field, the third field, and the fifth field are NTSC standard or PAL standard.
14. The device of claim 9 , wherein the chrominance judgment unit further comprises a carrier frequency observation unit for judging whether the 3D luminance signal and a next 3D luminance signal have a phase difference of 180 degrees.
15. The device of claim 9 , wherein the frequency range with respect to the carrier frequency of the chrominance component is adjustable.
16. A device for outputting a luminance signal in an image processing system, a composite video signal of a frame having a chrominance component and a luminance component, wherein a 3D (three dimensional) comb filter receiving the composite video signal of the frame and outputting a 3D luminance signal based on the luminance component, and wherein the chrominance component being modulated onto a carrier frequency, the device comprising: a field observation unit, comprising: a value comparison unit, judging whether a difference value between a maximum value in an N-point cycle of a first field and a maximum value in an N-point cycle of a third field or a difference value between a minimum value in the N-point cycle of the first field and a minimum value in the N-point cycle of the third field is greater than a threshold value, wherein N is a positive integer; and an edge area detection unit, judging whether the first field is in an edge of the frame; and an output unit, outputting the 3D luminance signal, of which a component within a frequency range with respect to the carrier frequency of the chrominance component is notch filtered, when at least one of the difference value of the maximum values and the difference value of the minimum values in the N-point cycles of the first and third field is greater than the threshold value, and a detection result of the edge area detection unit is false, or outputting the 3D luminance signal when the difference value of the maximum values in the N-point cycles of the first and third field is lower than the threshold value, the difference value of the minimum values in the N-point cycles of the first and third field is lower than the threshold value, or a detection result of the edge area detection unit is true.
17. The device of claim 16 , wherein the value comparison unit comprises: a value determination unit, determining the difference value between the maximum value in the N-point cycle of the first field and the maximum value in the N-point cycle of the third field and the difference value between the minimum value in the N-point cycle of the first field and minimum value in the N-point cycle of the third field; and a comparator, comparing the difference value of the maximum value in the N-point cycle of the first field and the maximum value in the N-point cycle of the third field with the threshold value and the difference value of the minimum value in the N-point cycle of the first field and the minimum value in the N-point cycle of the third field with the threshold value.
18. The device of claim 16 , wherein the frequency range with respect to the carrier frequency of the chrominance component is adjustable.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
November 4, 2011
April 16, 2013
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.